Persistent currents in a rotating superleak partially filled with superfluid helium. Interim report

Technical Report · Wed Dec 01 04:00:00 EST 1982

OSTI ID:6292601

Marcus, J S

Persistent currents in a partially helium II filled rotating super-leak have been investigated. Measurements were made using the acoustic doppler shift of the thickness wave in the helium II film which covers the alumina powder grains (1 micron) of the superleak. The existence of a potential flow region (Landau region) was established and measured at low rotational speeds (below 0.5 Hz). The decay rates of persistant current velocities were measured over almost five decades of time. We found a one-to-one correspondence with our system and that of a helium II filled superleak and also to the analogous quantities in an irreversible type-II superconductor.

• Research Organization: California Univ., Los Angeles (USA). Dept. of Physics
• OSTI ID: 6292601
• Report Number(s): AD-A-123522/5
• Country of Publication: United States
• Language: English

Related Subjects

640450* -- Fluid Physics-- Superfluidity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ACOUSTIC MEASUREMENTS
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
CHALCOGENIDES
COATINGS
CRYOGENICS
CRYSTAL STRUCTURE
DOPPLER EFFECT
EVEN-EVEN NUCLEI
FLUIDS
GRAIN SIZE
HELIUM 4
HELIUM II
HELIUM ISOTOPES
ISOTOPES
LIGHT NUCLEI
MICROSTRUCTURE
NUCLEI
OXIDES
OXYGEN COMPOUNDS
QUANTUM FLUIDS
SIZE
STABLE ISOTOPES
SUPERFLUIDITY
SURFACE PROPERTIES
VISCOSITY